Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3789652539f12ae…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 16:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d151eb3f6b0008792ec1e5fd00bacae SHA-1: 4c11b75d9acc291ca17e9bc201fa0ae5564c9ba1 SHA-256: b3789652539f12ae48413694e17f0a3b9627afa7997431f2b93bf4147f8dc09e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for initiating malicious actions. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lavalnerina.com/userfiles/file/piruseganamos.pdf In PDF document text
    • http://dagmar-e.de/userfiles/file/31743923288.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/3074585840.pdfIn PDF document text
    • https://equalland.com/uploads/File/56999312837.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/50166071707.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613580f7bae3d---wugifasajigaku.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/88341212175.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/68454058508.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/32501253496.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/19469439359.pdfIn PDF document text
    • https://ijpdua.com/contents/files/luwiwoju.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/73233113305.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483c4c5b51a---ripafufenates.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/lejokidenomuzitelidoz.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/zimebibosafa.pdfIn PDF document text
    • http://vce34.ru/attachments/file/nusopiwoboxi.pdfIn PDF document text
    • https://ka-base.no/images_students/files/75753347204.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/33233952009.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/xuveduwuvajuxovuwogasewot.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e878b9050e3be5031d23b54374d5fe7f/37929728139.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219122248114243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+screen+test+codePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 17704 bytes
SHA-256: d6ea941d9eca44a0a30ded19782ceb198314d2561eaf09e90c8ee535ec206fa3
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 10136 bytes
SHA-256: 5d33c7b6a55f4a98870d8c40f298e6869001e429b2be41d3ec0a93fa65eef6a0
font_02_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1